trump russia hacking doubts newday seg_00004204.jpg
trump russia hacking doubts newday seg_00004204.jpg
Now playing
03:22
Trump casts hacking doubts again
President Donald Trump speaks during a rally, Thursday, Aug. 2, 2018, at Mohegan Sun Arena at Casey Plaza in Wilkes Barre, Pa. (AP Photo/Matt Rourke)
Matt Rourke/AP
President Donald Trump speaks during a rally, Thursday, Aug. 2, 2018, at Mohegan Sun Arena at Casey Plaza in Wilkes Barre, Pa. (AP Photo/Matt Rourke)
Now playing
02:16
Trump slams probe 'hoax' despite intel warning
MOSCOW, RUSSIA - NOVEMBER 09: Emin Agalarov, Donald Trump and Aras Agalarov attend the red carpet at Miss Universe Pageant Competition 2013 on November 9, 2013 in Moscow, Russia. (Photo by Victor Boyko/Getty Images)
Victor Boyko/Getty Images
MOSCOW, RUSSIA - NOVEMBER 09: Emin Agalarov, Donald Trump and Aras Agalarov attend the red carpet at Miss Universe Pageant Competition 2013 on November 9, 2013 in Moscow, Russia. (Photo by Victor Boyko/Getty Images)
Now playing
02:23
Russian pop star trolls Trump in music video (2018)
Trump WH 5
CNN
Trump WH 5
Now playing
01:31
Trump: It is possible I will meet with Putin
Now playing
01:06
Toobin calls Giuliani claim 'corrupt and unethical'
CNN
Now playing
00:54
Giuliani: Stop the possibility of impeachment
Getty Images
Now playing
03:03
GOP members slam Trump's Russia comments
Now playing
00:10
This video is no longer available
CNN
Now playing
01:38
Giuliani: Trump has right to know FBI source
Now playing
01:21
Trump says 'disgraceful' if FBI spied on campaign
Getty Images
Now playing
01:34
Trump lawyers seek to limit Mueller interview
CNN
Now playing
02:45
Page: Never found anything unusual about FBI source
WASHINGTON, DC - JUNE 08:  Former FBI Director James Comey testifies before the Senate Intelligence Committee in the Hart Senate Office Building on Capitol Hill June 8, 2017 in Washington, DC. Comey said that President Donald Trump pressured him to drop the FBI's investigation into former National Security Advisor Michael Flynn and demanded Comey's loyalty during the one-on-one meetings he had with president.  (Photo by Chip Somodevilla/Getty Images)
Chip Somodevilla/Getty Images
WASHINGTON, DC - JUNE 08: Former FBI Director James Comey testifies before the Senate Intelligence Committee in the Hart Senate Office Building on Capitol Hill June 8, 2017 in Washington, DC. Comey said that President Donald Trump pressured him to drop the FBI's investigation into former National Security Advisor Michael Flynn and demanded Comey's loyalty during the one-on-one meetings he had with president. (Photo by Chip Somodevilla/Getty Images)
Now playing
01:08
Comey: Trump won't criticize Putin, even in private
UNTV
Now playing
02:27
Nikki Haley: I don't get confused
US President Donald Trump (L) chats with Russia's President Vladimir Putin as they attend the APEC Economic Leaders' Meeting, part of the Asia-Pacific Economic Cooperation (APEC) leaders' summit in the central Vietnamese city of Danang on November 11, 2017. / AFP PHOTO / SPUTNIK / Mikhail KLIMENTYEV        (Photo credit should read MIKHAIL KLIMENTYEV/AFP/Getty Images)
MIKHAIL KLIMENTYEV/AFP/Getty Images
US President Donald Trump (L) chats with Russia's President Vladimir Putin as they attend the APEC Economic Leaders' Meeting, part of the Asia-Pacific Economic Cooperation (APEC) leaders' summit in the central Vietnamese city of Danang on November 11, 2017. / AFP PHOTO / SPUTNIK / Mikhail KLIMENTYEV (Photo credit should read MIKHAIL KLIMENTYEV/AFP/Getty Images)
Now playing
02:03
Russia reacts to Trump's Syria strike tweets
US President Donald Trump and Russia's President Vladimir Putin hold a meeting on the sidelines of the G20 Summit in Hamburg, Germany, on July 7, 2017. / AFP PHOTO / SAUL LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)
SAUL LOEB/AFP/Getty Images
US President Donald Trump and Russia's President Vladimir Putin hold a meeting on the sidelines of the G20 Summit in Hamburg, Germany, on July 7, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Now playing
01:26
US hits Putin allies with new sanctions

Story highlights

Trump said another culprit aside from Russia could have been behind the US election hack

"It could be somebody else. And I also know things that other people don't know," he said

West Palm Beach, Florida CNN —  

President-elect Donald Trump said Saturday he has information that others lack and promised to reveal his knowledge this week, reiterating again his doubts that Russia was behind cyber-meddling in the US election.

Speaking to reporters ahead of an 800-person New Year’s Eve bash at his Mar-a-Lago estate, a tuxedoed Trump maintained that another culprit aside from Russia could have been behind the tampering.

“It could be somebody else. And I also know things that other people don’t know, and so they cannot be sure of the situation,” he said.

Asked to describe what undisclosed information he knew, Trump said, “You’ll find out on Tuesday or Wednesday.”

Trump has scheduled an intelligence briefing midweek on the hacking, a response to President Barack Obama’s announcement of new sanctions on Moscow in retaliation for the cyber-intrusion.

“I just want them to be sure, because it’s a pretty serious charge, and I want them to be sure. And if you look at the weapons of mass destruction, that was a disaster, and they were wrong,” Trump said, referencing failed intelligence in the lead-up to the Iraq War as a reason for skepticism.

“I think it’s unfair if they don’t know,” he said. “And I know a lot about hacking. And hacking is a very hard thing to prove.”

Trump has repeatedly cast aside a US intelligence assessment announced in early October that Moscow was behind the hacking, despite already receiving classified intelligence briefings on the matter. He’s also praised Russian President Vladimir Putin, calling him smart this week for withholding reciprocal sanctions on the US.

Trump’s stance has put him at odds with most congressional Republicans, who have argued for a tougher stance on Russia. Sen. John McCain, the Republican chairman of the Armed Services Committee, will convene a hearing on cyber-threats Thursday.

Officials expelled

On Sunday morning, a Rossiya Airlines Special Flight Squadron plane believed to be carrying some expelled Russian government officials departed Dulles Airport just outside Washington. The US had ordered 35 officials and their families from the embassy in Washington and the consulate in San Francisco to leave the country by noon Sunday in response to charges that Russians hacked the presidential election and harassed US diplomatic personnel in Russia.

A State Department official told CNN early Sunday evening all of the expelled Russian diplomats have left the US. “We can confirm that the 35 Russian diplomats declared persona non grata have, along with their family members, departed the United States.,” the official said.

Congressional Democrats on Sunday scoffed at Trump’s assertion that Russian involvement wasn’t clear.

“It’s very solid,” said Rep. Adam Schiff of California, the top Democrat on the House Intelligence committee, on ABC’s “This Week.”

Schiff called Trump’s approach “dangerous,” adding, “If he’s going to have any credibility as president, he needs to stop talking this way. He needs to stop denigrating the intelligence.”

community. He’s going to rely on them.

At Mar-a-Lago Saturday, Trump expressed deep misgivings about technology during his brief exchange with reporters positioned outside his Grand Ballroom.

“If you have something really important, write it out and have it delivered by courier, the old-fashioned way, because I’ll tell you what, no computer is safe,” he said. “I don’t care what they say, no computer is safe.”

Scheduled to return to New York Sunday after two weeks at his Palm Beach mansion, Trump told reporters his New Year’s resolution was to “Make America Great Again.”

“I’ll do that one,” he said.

CNN’s Kevin Bohn contributed to this report.